Molybdenum-91

Properties and data of the isotope ⁹¹Mo.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Molybdenum isotopes (and general data sources).

General data

Name of the isotope:Molybdenum-91; Mo-91Symbol:⁹¹Mo or 9142MoMass number A:91 (= number of nucleons)Atomic number Z:42 (= number of protons)Neutrons N:49Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1666666666667 (= neutron-proton ratio)Neutron excess (N-Z):7Isotopic mass:90.911745(7) u (atomic weight of Molybdenum-91)Nuclide mass:90.8887057 u (calculated nuclear mass without electrons)Mass excess:-82.209 MeVMass defect:0.84148722800001 u (per nucleus)Nuclear binding energy:783.84030396 MeV (per nucleus)
8.61362971 MeV (average binding energy per nucleon)Separation energy:S_N = 10.108(7) MeV (first neutron)
S_P = 6.836(7) MeV (first proton)Half-life:15.49(1) minDecay constant λ:0.00074580071073805 s^-1Specific activity α:4.990352148339 × 10⁺¹⁸ Bq g^-1
134874382.38755 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2+Magnetic dipole moment:μ(μ_N) = -0.931(3)Nuclear g-factor:g_l = -0.20688888888889Charge radius:4.3182(11) femtometer fmYear of discovery:1948

Radioactive Decay

Half-life T_½ = 15.49(1) min (minutes) respectively 9.294 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁹¹Nb	100 %	4.429(7) MeV

Parent Nuclides

Direct parent isotope is: ⁹¹Tc.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^91mMo	653.01(9) keV	64.6(6) s	1/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 91) with Molybdenum-91. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 49	Isobar A = 91
27	⁷⁶Co
28	⁷⁷Ni
29	⁷⁸Cu
30	⁷⁹Zn
31	⁸⁰Ga
32	⁸¹Ge
33	⁸²As	⁹¹As
34	⁸³Se	⁹¹Se
35	⁸⁴Br	⁹¹Br
36	⁸⁵Kr	⁹¹Kr
37	⁸⁶Rb	⁹¹Rb
38	⁸⁷Sr	⁹¹Sr
39	⁸⁸Y	⁹¹Y
40	⁸⁹Zr	⁹¹Zr
41	⁹⁰Nb	⁹¹Nb
42	⁹¹Mo	⁹¹Mo
43	⁹²Tc	⁹¹Tc
44	⁹³Ru	⁹¹Ru
45	⁹⁴Rh	⁹¹Rh
46	⁹⁵Pd	⁹¹Pd
47	⁹⁶Ag
48	⁹⁷Cd
49	⁹⁸In
50	⁹⁹Sn